A new use for my Glock 27...

[TheProf]

Ok. I know its user failure. It's a glock after all.

But... even with a death grip.. I'm getting only a 99% success rate with my G27. That's even when using only standard 9 round mags. (I initially thought it was me using the larger mags or +2 extensions....so I switched to using only standard mags.) Just when I thought I had solved the issue...I started to get again the occasional failure to feed/go to battery. The gun locks open and fails to chamber the next round.

It's an easy fix... tap, rack, and bang. But I would prefer 100% reliability.

So now, I've decided to carry my G26 instead. (3000 rounds with no failures of any kind.)

But what I thought would be a new use for my G27 would be to use it to practice handling better my G26. Firing .40 range ammo (with its snappy recoil) would be a cheaper way to simulate firing expensive 9mm +P hollow points.

Any of you guys do the same thing? Using .40 to simulate firing expensive 9mm hollow points? (The two gun platforms are dimensionally identical.)

 

[ku4hx]

My 27 has been flawless in both native .40 S&W mode and converted 9mm mode with any and all capacity magazines for the cartridge in-play. My model 30SF had the exact problem you described.

Glock fixed my 30SF on their dime and the root cause was the slide rubbing on the riser that presses on the firing pin safety. You could see the scar on the trigger bar riser. After Glock replaced the trigger bar, the problem was solved but the slide still just barely grazed the riser. Since I have a spare, I used my Dremel tool to buzz off the new bar's little scratch mark and then polished the area with 600 grit emery cloth. Now, the gun functions perfectly and there is no rubbing at all.

Never heard of the 27 having that problem, mine certainly doesn't, but tolerance stacking can occur in anything mechanical. Why not give Glock a call and talk to them? I'd never just accept a workaround for a real problem without some kind of dialog with Glock first.

 

[LiveLife]

Same here. G27 travels with me everywhere I go (even carried inside the house) and it's been flawless regardless of the ammo I feed it and magazines used (I use G22 magazines and G27 magazines with Pearce +1 mag base extension).

I do the opposite as OP using near max load data 9mm reloads and 40-9 conversion barrel to practice with cheaper 9mm reloads. For me, trigger time is hard to beat in conducting various drills/shooting exercises to improve close range tactical shooting. Of course, I also shoot 40S&W practice reloads that are duplicated to same POA/POI as factory JHP loads.

 

[voyager4520]

1. Is the slide stop locking into the slide when the slide locks open?
2. Or it is a failure to feed?
3. What kind of ammo are you shooting?
4. How many rounds have you shot through the gun, and did the gun previously work fine?

Seeing as it happens with multiple magazines, you might need a new extractor. Some of the newest extractors can be oversized and fit too tight, in a .40 they'll usually cause failure to feed.

Another issue with recent production .40 Glocks is that the magazines have little protrusions of plastic at the front of both feed lips, those protrusions can be oversized and rub against the top round as it rises, slowing its rise and causing a failure to feed. You can trim those protrusions back until the magazine feeds properly.

Plastic protrusions in the magazines: http://i51.tinypic.com/2a649he.jpg (click the link, if I try to display it as an image it's huge)

To determine which magazines have the issue and which don't, each time you experience a failure to feed take the magazine that it happened with and set it aside, don't use it for the rest of the range trip. Continue setting magazines aside until you end up with some that don't fail to feed. This is the more expensive route because you use a lot of ammo doing it, and it may not even be the true problem. I'd recommend trying a new extractor first.

If the gun previously worked fine and only now started to fail to feed, I'd try a new guide rod assembly, detail strip and clean the slide, and open and clean the magazines. Don't get any excess oil in the slide internals, excess oil in those areas will quickly collect residue and cause failures to fire and failures to feed.

 

[Averageman]

Greased the slide rails lately?
I have a Custom slide and barrel combo on a G17 that I CC and had the same issue until I fired 200 rounds through it with the rails lubricated with Amsoil white lithium grease. It just takes a model paint brush to lightly apply a smear.
Sometimes a tight chamber and slide combo just need to be worked with a bit.
A tube of this goes on all of my rails on all of my guns and I haven't had an issue.

 

[TheProf]

I have fired about 3000 rounds through this gun (G27).
There's a recurring theme of 1% failure.
The gun locks back (as if the magazine is empty) and the chamber is empty. The remaining rounds are still in the magazine.

To fix the problem, I simply pull the slide back and let it sling shot forward back into battery.

This has happened in WWB (180 grain) FMJ, Federal 180 grain FMJ, and PDX1 (JHP).

And the problem is not related to one single magazine. (Also, I just replaced the recoil spring assembly and have fired 300 rounds through it. And I just bought a brand new standard 9 round factory magazine. At this point, I'm assuming that I have basically a brand new firearm.)

I also clean my guns and lubricate the slide at the end of every firing session. (150 rounds per practice session)


Any ideas?

 

[LiveLife]

I'm getting only a 99% success rate with my G27

I have shot a lot of Glocks and they have all been 100% reliable with factory ammunition.

For me, with various design features engineered into Glocks, anything less than 100% reliability with various factory FMJ/TMJ/RN/TCFP/JHP would be considered unacceptable.

I would take the G27 back to the store where you bought it and have them verify the problem then have them contact Glock for repair/return. If that's not an option, I would have a Glock armorer take a look at the G27 and then contact Glock.

 

[GLOOB]

The gun locks back (as if the magazine is empty) and the chamber is empty. The remaining rounds are still in the magazine.

To fix the problem, I simply pull the slide back and let it sling shot forward back into battery.

Any ideas?

http://www.youtube.com/watch?v=gVSJjCeDRwk&feature=relmfu

fast forward to 6:25. Do your FTF's look like this? If they do, it's your slide lock lever.

Remove the slide. Look at the slide lock lever. Make sure it's assembled correctly, with the spring resting under and tensioned by the small frame pin.

If it's assembled correctly, try this. Remove the lever and reassemble the pistol without it for your next range session. The greater recoil could be shifting your grip enough to cause user-induced slide lock. IOW, keep your thumb off the lever!